Jawaharlal Nehru Technological University Hyderabad B.Tech III Year EMBEDDED SYSTEM DESIGN Previous Question Paper (February/March - 2022 - R18)

Embedded systems are classified based on their functional requirements, performance, and complexity. The primary classifications are as follows:

1. Small-Scale Embedded Systems: These are designed for simple, single-task operations. They typically use an 8-bit or 16-bit microcontroller, have limited memory, and are not time-critical. Example: A digital camera or a simple electronic toy.

2. Medium-Scale Embedded Systems: These systems are more complex, often using 16-bit or 32-bit microcontrollers or DSPs. They involve more sophisticated hardware and software, often requiring an embedded operating system. Example: Industrial process controllers or networking equipment like routers.

3. Sophisticated (Large-Scale) Embedded Systems: These are highly complex systems requiring scalable processors, high-performance hardware, and sophisticated real-time operating systems (RTOS). They often involve hardware-software co-design and are used in mission-critical applications. Example: Flight control systems or advanced medical imaging devices.

4. Standalone Embedded Systems: These systems function independently without requiring a host computer. They take input, process it, and provide output directly. Example: A microwave oven or a washing machine controller.

5. Real-Time Embedded Systems: These are designed to perform tasks within a strictly defined time constraint. They are further divided into:

• Hard Real-Time Systems: Missing a deadline results in total system failure (e.g., Anti-lock Braking System in cars).
• Soft Real-Time Systems: Missing a deadline results in degraded performance but not system failure (e.g., video streaming or audio playback).

6. Networked Embedded Systems: These systems are connected to a network (LAN, WAN, or Internet) to access resources or communicate with other systems. They use protocols like TCP/IP. Example: Home automation systems or web-enabled security cameras.

7. Mobile Embedded Systems: These are portable devices with limited power and size constraints, often incorporating wireless communication capabilities. Example: Smartphones and wearable fitness trackers.